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FIGURE 1 MISSOURI RIVER BASIN .., ;/ ~ r- ,""""... {. ".,,,, /" "'h U'".c " \ """ " ....."...... ; ,,~ ' . \ '.r-\[r--..:r---\j COLORADO abound. Some relatively uneroded glacial debris remains as the ice left it, piled in hummocks without order and endosing many shallow basins. ponds, and swamps. A distinctive 24.000-square.mile area within the province is the Sand Hills in north-central Nebraska. The Central Lowlands province. within the Interior Plains division, borders the Great Plains province to the east, bul generally there is no perceptible line of demarcation between them. Roughly the 88.000-square- mile area extends between a line from l:imeslowll. N. Dak., to Salina, Kans.. and the Mississippi River drainage divide. This entire area has been developed by erosion of a mantle of drift and till deposited by the continental glaciers. An abundance of rainfall and stream develop. ment has created a hilly topography in many places. but especially in the southern portion of the province. 6 \1 ~ ! . \ '0""".'00000 '00 :00 ~...~"..~T[ "...[ ,~ "'L.[S MItHH:son. 10"'.... ."0".. "'>P.. IKANSAS {f ~~{ : , n---in~~OlJRI_.- ;\ --ir-- In the southeast portion of the basin is the Ozark Plateaus province of the Interior Highlands physiog' graphic division. The topography of this II .OOO-square- mile area was developed by erosion of the ancient. though moderate. Ozark uplift and generally is hilly to mountainous. This moderate uplift lllld great depth of the underlying sedimentary formations leave only the sedimentary rocks exposed. Limestones are the b::Jsil; sedimentary formations :lI1d gave rise to cavernous underground channels with many flowing springs in the area. Because the basin is so vast and was intluenced by a variable geologic historICal development. Illany sectional variations exist, as shown III figure 3. This reflects eight major types of area, considering soil types and the dominant topographic characteristics.